Tamasakai Tennen Onsen Mori no Aya
Machida, Tokyo, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Machida, Tokyo, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Tamasakai Tennen Onsen Mori no Aya is located in Machida, in the Tokyo metropolitan area, on the western edge of the capital. Sodium-chloride thermal water flows at 41°C, available in an indoor bath, an outdoor rotenburo, and a sauna.
Insider tip — 'Mori no Aya' (森のあや — forest brocade) draws dark sodium-chloride thermal water from the Kanto Basin in Machida — one of Tokyo's most forested cities, known for its vibrant shopping streets and proximity to the Tama Hills. The 'Tamasakai' name references the historic Tama River boundary between Musashi (Tokyo) and Sagami (Kanagawa) provinces; Yokoku-ji Temple (1206 AD) and the expansive Yamazaki Forest reflect Machida's surprising greenery within the megalopolis.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.